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Debt - Summary of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 28, 2015		Dec. 31, 2014	Nov. 30, 2014
Debt Instrument [Line Items]
Long-term debt, total	$ 1,983.0us-gaap_DebtAndCapitalLeaseObligations		$ 1,718.7us-gaap_DebtAndCapitalLeaseObligations
Less — Current portion	(10.6)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	[1]	(243.7)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt	1,972.4us-gaap_LongTermDebtAndCapitalLeaseObligations	[1]	1,475.0us-gaap_LongTermDebtAndCapitalLeaseObligations
Other
Debt Instrument [Line Items]
Long-term debt, total	8.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember		0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Credit Agreement — Term Loan Facility | Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, total	500.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember		0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember
Weighted Average Interest Rate	1.68%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember
8.125% Senior Notes due 2020 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, total	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		243.7us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Weighted Average Interest Rate			8.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
4.75% Senior Notes due 2023 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, total	500.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		500.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Weighted Average Interest Rate	4.75%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		4.75%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
5.375% Senior Notes due 2024 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, total	325.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		325.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Weighted Average Interest Rate	5.375%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		5.375%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
5.25% Senior Notes due 2025 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, total	$ 650.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		$ 650.0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Weighted Average Interest Rate	5.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		5.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
[1] Unaudited.

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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X

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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X

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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